Aesthetic Agatized Eocene Gastropod Fossil

Description: At the recent Tucson fossil show I came across a grouping of gastropods whose shells had been replaced by agate. They are quite stunning visually, and I picked up a few, along with some agatized bivalves. While this one is almost certainly a member of the family Cerithidae, I do not know what genus it may be. It seems closely related to the genus Bittium by virtue of the ornamentation to the shell but I do not have the temerity to assign it as such This one comes in a glass fronted display box.